Which of the following statements is true of the term "cloud"?

a$.$

It refers to a closed network or a single set of services controlled by one dominant firm.

b$.$

It refers to a situation when the value of a product or service increases as the number of its users expands.

c$.$

It refers to a collection of computing resources available for access over the Internet.

d$.$

It refers to the phenomenon of adapting products and services for different languages and regional differences.

e$.$

It refers to a situation when others take advantage of a user or a service without providing any sort of reciprocal benefit.